More than 100 million iPhones are now in use in the United States

Breaking it down, the estimates show that upwards of 58 million of active iPhones in the United States are iPhone 6 or iPhone 6 Plus units. There are already four million iPhone 6s and/or iPhone 6s Plus units in the U.S., based on the data. The data also seems to show that the 4.7-inch iPhone 6/6s model is the most adopted.

Interestingly enough, the data also shows that while Apple has certainly hit a milestone in the U.S., things are beginning to taper off as the market has matured. The data shows that over the course of eight years, the iPhone installed based grew by an average of 8%.